628397131 has 2 divisors, whose sum is σ = 628397132. Its totient is φ = 628397130.

The previous prime is 628397117. The next prime is 628397149. The reversal of 628397131 is 131793826.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 628397131 - 2¹³ = 628388939 is a prime.

It is a super-2 number, since 2×628397131² = 789765908498062322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (628337131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314198565 + 314198566.

It is an arithmetic number, because the mean of its divisors is an integer number (314198566).

Almost surely, 2^628397131 is an apocalyptic number.

628397131 is a deficient number, since it is larger than the sum of its proper divisors (1).

628397131 is an equidigital number, since it uses as much as digits as its factorization.

628397131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 40.

The square root of 628397131 is about 25067.8505460680. The cubic root of 628397131 is about 856.5342451190.

The spelling of 628397131 in words is "six hundred twenty-eight million, three hundred ninety-seven thousand, one hundred thirty-one".